The OAuth2 Grant Type/Flow Introduction – In Simplified Pictures

The simplified introduction and quickest reference for all 4 OAuth2 Grant Types also known as OAuth2 Flows. ‘A picture is worth a thousand words’ so we carefully crafted a picture for each OAuth2 Grant Type to depict the important details, and highlight the differences between the 4 flows. For more details on choosing the correct OAuth2 Grant Type for your needs, see this.

UPDATE: Based on feedback, most people have indicated that this is great as a quick reference, but some explanation will be super useful for those rather new to OAuth2. We listened, and so here is the version with some words!